package com.example.gateway.filter;

import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.util.StringUtils;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * @title: TokenFilter
 * @description: 全局过滤器，用于校验前端访问token
 * @author: brucewong
 * @version: 1.0
 * @date：2019/10/27 11:05
 */
@Slf4j
public class TokenFilter implements GlobalFilter, Ordered {
    private static String AUTH_TOKEN  = "123456";
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        HttpHeaders headers = request.getHeaders();
        String token = headers.getFirst("token");
        if (StringUtils.isEmpty(token) || !AUTH_TOKEN.equals(token)) {
            log.info("token in headers must have value----------------");
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}